A negative of the initial image lends to perception of a nighttime, rather than a daytime, scene.

The first in a series of daytime scenes,
the eye seeing hills in the background and a plain in the foreground.

By simply changing the color of the foreground,
the viewer now sees a lake with sandy beach in the foreground and hills in the background.

This time, a change in all the terrain provides a view of a desert,
a stark change from the first two daytime scenes.

By darkening the desert picture as a whole, we come up with a nighttime scene.
Here, the dark cloud lends a feeling of danger as though it were a storm cloud.

Sticking to dark colors for a nighttime effect, we can go back to the lake.
The lighter cloud adds serenity, opposing its meaning in the previous picture.

Soften the colors further on the lake scene to obtain a pastel version of dawn or dusk.

The above picture is only black and white. By simply changing/stressing one object in the picture with a color, the overall effect is softened.